Nautilus

Ladies and gentlemen, what you see before you today is my own interpretation of the Nautilus from Jules Verne's "20,000 Leagues Under the Sea". This is basically how I imagine it would have looked if it's captain, the enigmatic Captain Nemo, was a bit more... how shall I say... deranged. As such, I have dispensed with the naval ram as the primary method of attack and replaced it with a far more destructive spar torpedo (filled with however-many pounds of... I don't know. Something stronger than gunpowder... picric acid? I'm improvising here). Complementing this more modern and practical weapon of war are two wildly impractical (but still incredibly awesome) retractable turrets, one amidships and one aft, containing two 7 Inch RBL Armstrong guns each. Yes, that's right; you heard me. Retractable turrets... on a submarine... as luck would have it, I'm not the only one who's had this idea (see link below).
But the liberties that I have taken with the design of the Nautilus go far beyond the ship's armament. I have also decided to add a bit of "steampunk" flair to it by making it steam powered, hence the funnels. Yes, I know what you might be thinking, but a steam-powered submarine has been done before. Sure, they weren't able to compete with more reliable diesel-powered submarines around the turn of the century... but who cares?! Steampunk! =D
Allow me to address any more concerns you might have about the feasibility of such a design by using the magic of handwaving:
The turrets, operated by a hydraulic mechanism located within the hull, are fully retractable in order to seal them off when submerged. The funnels, while not being able to retract into the hull, are sealed off internally by large flapper valves. When surfaced, the funnels are drained of excess water, which is then either discharged out to sea or recycled to be used as coolant for the engine or as hydraulic fluid for various machines... or whatever... It doesn't matter. The only thing that matters is... LOOK HOW COOL THIS THING IS!!!
Credit goes to Scolty for the hatches, Nottamun for the smoke, and TheCeladon for the propeller (I also used his richly detailed model of the Nautilus from the 1954 film as a reference when designing the large observation windows).
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